Do you know what is the lithium iron phosphate ion battery maintenance skills?

　　Author ：Iflowpower – Portable Power Station Supplier

The battery pack is to first in parallel with 2 10A of the cell, then constitute 16 strings, constitute a battery pack of 48V / 20A. After viewing, confirm that the battery pack is normal, and the connecting piece, the protective plate and the wiring are normal. The battery pack has a total voltage of 54.

7V, but the output voltage is only 36V. The battery pack voltage is examined by the multimeter, found that there is a set of battery voltages of 2.55V (the red frame in Figure 4 is a battery pack of the voltage), and the remaining battery pack voltages are around 3.

5V. Due to the maintenance related experience without ferric lithium ion battery, there is no circuit diagram and related parameters, you have to charge the battery to automatically stop. At this time, the other set of voltages is about 3.

65V, and the set of voltage is only 2.75V, and the corresponding indicator on the balanced protector is not bright, as shown in Figure 5. The heat sink has been heated, indicating that the protective plate has begun to equalize the voltage group voltage.

At this time, the total output voltage is 57.41V, and the battery pack or equalization protective plate having a low voltage is abnormal. Review the information, this is an important characteristic of the lithium iron-ion battery equilibrium protective plate: When charging, when the voltage of any set of batteries in the battery pack reaches 3.

7V, the protective plate cut off the charging circuit to prevent the battery from overturizing; discharge, When the voltage of any of the batteries in the battery is less than 2.5V, the protective plate cut off the external power to prevent the battery from being overprint (the author has pushed several times). When the corresponding set of battery voltages is higher than 3.

5V, the protective board begins to balance. It seems that the fault is caused by the battery low in the set of electricity. This is an important because the inconsistency of the iron lithium-ion battery is more serious.

In the long-term use, the battery voltage is gradually below other batteries, and the usual charge is not well made to make the battery balance (the original lead-acid battery of the author After the scrap, the charging time is set to each charge), resulting in that the battery voltage is getting lower and lower than other batteries (capacity is much lower than other groups). In this way, in use, the protective plate will cut the power supply of the entire battery pack due to the unit of the battery leader to protect the battery. According to the principle of wooden bucket, the capacity of the entire battery pack depends on the lowest cell.

When charging, since other groups of battery capacity and voltage are higher than the low voltage group battery, the voltage of other group batteries has reached the switching voltage of the protective plate in the low voltage group battery capacity. Charge charging. Such a vicious circle, causing low voltage groups to charge, resulting in lowering the capacity of the entire battery pack, and is in use, the cycling distance is getting shorter.

1536890919947068.jpg Although the battery has a balanced protector, this equalization effect is very limited. Its principle is to discharge the battery pack with high setting voltage.

After the set voltage is reached, the charge circuit is turned on to charge the entire battery pack, so that the rear battery pack has the same voltage as other groups. But this discharge current is not very large, otherwise the heat generation and device life have become a problem. The author has plugged into the charger to automatically balance the battery pack, and the battery pack voltage with low voltage is only raised to 3.

33V. The efficiency is too low, I have to be balanced. The author uses an iron lithium-single battery special charger, and the low voltage battery pack is charged separately, and the battery pack voltage is monitored.

The time charging depends on the remaining capacity and charging current of the battery pack. After the rated voltage is filled, stand for 1 to 2 hours, then full of batteries. After no obvious voltage drop, it can be used to charge the entire battery with the original charger.

[Tip] The output voltage of the charger of the phytithium unit cells is 3.65V. If there is no dedicated charger, you can also find a DCDC power module that output voltage adjustable, set the output voltage to 3.

65V backplane. After the Iron ion battery is maintained, it will restore the vitality, and it can ride nearly 40km, which is basically recovered. After such a toss, there are several related experiences and recommendations using iron lithium-ion batteries for readers.

1) When the lithium iron phosphate ion battery is charged, don't eager to unplug the charger plug, you must have sufficient time to automatically balance the battery pack, so that all groups are full. Otherwise, it is possible to cause individual battery pack voltages to gradually be lower than other groups and affect the normal use of the entire battery pack. 2) If the battery pack capacity decreases in a short time, it must take into account the balanced problem of battery packs outside of the physical external force factor (such as the falling car to fall off).

Readers who know more and have a sense of hands-on ability, it is best to open the battery for manual balance. 3) Battery housing is preferably do not use stainless steel housing, not only new costs, but also difficult to remove during maintenance. 4) If it is found that the battery pack uses an abnormality, it must be maintained in time to prevent the battery pack to be irreversible damage.

5) It is recommended that people with a certain electronic base use of lithium phosphate ion batteries because the maximum problem of such a battery is inconsistent between the battery pack. In the absence of a balanced protector, the entire set of batteries is not bad. When repairing, if the battery performance is scrapped in a set of battery performance, it is too disadvantageous.

6) Not recommended online shopping lithium iron phosphate ion battery pack. Because online shopping battery packs are mostly electric vehicles eliminated, the performance is uneven. If you don't know how to maintain, you will be scrapped quickly.

About the readers with hands-on, buy a new battery yourself. 7) Do not use the battery pack without equalization protection board, easy to cause excessive charge, overhang, or individual battery pack performance, shorten battery life, shorten battery life. 8) Maintenance must be carried out in strict accordance with the operating rules, and cannot be shorted.

Due to the small internal resistance, the short circuit will instantly lead to smoke damage, and even dangerous accidents such as fire, explosion. 9) Because of disassembly, the order of installing the balanced protective plate is incorrect to cause it to damage, so it is easy to remove the balanced protector when maintenance is maintained.